Isaac j



' @einstein @anni @man ISAAC 5J.. HATTABCUGH, oF SANTA 5 CLARA COUNTY,CALIFORNIA. ,Letters Patent No. 71,749, dated December 3, 1867.

IMPROVEMENT IN` FIELD-DEBRIGK.

TO WHOM THESE PRESENT@ SHALL COME:

i Be it known that I, ISAAC J. HATTABOGH, ofthe county of Santa Clara,State of California, have invented a new and useful Improvement inField-Derricksf, ofwhieh the following description and accompanyingdrawings ar'e an' exact and clear description. Y

.The purposes of my improvement are to form a derrick of the simplestkind, and of such strength and rig' as to make the ability to erectvandcapaci-ty to use within the scope of the most ordinary farm-laborer;also to enable its being used in elevating-and transporting hay o rgrain Vto a greater distance than any other of as simple construction.It is formed of one upright -poleaboutfthirty feet long, six inches atthe'base, four inchesat the top, with an arm eighteen feet long', threeby four inches in size. The foot-blocks may bo ve feetlong, in size fourby ve inches- .fastened to the ground by two stakes passing through twostraps at the end. The guy-ropes are each about seventy feet in. length,one and one-quarter inch in size, and are three in number;thcworkingropes areione inch in diameter.. 'The bottom of the pole isshod with a steel plate,l through whichpasses a pin intoV the pole, andalso passes through-a steel plate-on the foot-block, forming a pivotfor'the action oi the polo or derrick. 0n the top ofthe pole is a pin,upon which acts the guy-plate'. About one-third down from 'the top ofthe pole is a collar with two eyes, which clasps the pole in anypositionit may be placed, and to which is attached the arm, which isfurnished with 'a seat-cap of wood and metal, having two hooks to hitchupon the eyes of thecollar. Upon the mainV pole, belowthis collar, andalso belwth'c guy-plate, are notched into the pole, on opposite sides,recesses for the sheaves to work in, the upper one for the arm-guide,the lower one for two sheaves for the hoisting-ropeto pass between, tohold and work steadily to prevent chang and wearan important item in.the construction and working a derrick of this form, as thewcar andehaiing of a constantrunning rope are,\if otherwise operated, v crymaterial. The arm isopcrated bythe guide-rope, passing from the end ofthe arm, where it isfastened to an eye-bolt, throughand over the sheaveat the top of the pole, and down to the cavel. The working-rope isfastened to the fork or the object to be lifted, and then passes to t`hedonble- Isheave block at the end o f the arm; then through the sheavesbelow the collar on the pole, down to the block attached to thefoot-block, and to where thepower is attached. I

I claim to use aiighter'vpole and longer arm than can be used by anyother form of dem-ick.; The' notched pieces that cover the sheaves arebolted to theV pole. The braccand working-ropes being on oppositesides/of the pole, actin combination to brace the same, making thisstronger, casier of adjnstability, simpler action upon its pivotedcentre, greater sweep of arm, and of fewer complications than are foundin any derriek used' for the purposes claimed.

Figure 1 is the derrck erected.

Figure 2 is thederrjck erecting.

A is the pole; B the'arm;' C the footing; D, adjnstingropc; E,opcratingfro'pe; J J J, guys; Gr, collar; H, sheaves or blocks; I,pivots `and plates; K is the fork; L, guide-line.

i Claim.

Iclaim- 1. The double sheaves for the operatiugline.

2. Iclam the pivots and plates at top and bottom of the pole, for theguys and pole-swivel.

3.. I claim the combination of the sheaves H with the pivots to platesII, in combination with 'operating-rope E, po1e A, arm B, adjuster D,guys J, to make a simple and complete combination for n derriek forfield purposes, as described, and substantially as set forth.

ISAAC J. HATTABOUGH.

Witnesses:

JAs. ALEX. FORBES, Jr., 'ALFRED R. WooDnAMs, J. M. BILLINes.

